421070509 has 4 divisors (see below), whose sum is σ = 430029504. Its totient is φ = 412111516.

The previous prime is 421070443. The next prime is 421070513. The reversal of 421070509 is 905070124.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 421070509 - 2¹⁵ = 421037741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421070539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4479427 + ... + 4479520.

It is an arithmetic number, because the mean of its divisors is an integer number (107507376).

Almost surely, 2^421070509 is an apocalyptic number.

It is an amenable number.

421070509 is a deficient number, since it is larger than the sum of its proper divisors (8958995).

421070509 is an equidigital number, since it uses as much as digits as its factorization.

421070509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8958994.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 421070509 is about 20520.0026559452. The cubic root of 421070509 is about 749.5229612356.

The spelling of 421070509 in words is "four hundred twenty-one million, seventy thousand, five hundred nine".